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Sharks are a group of elasmobranch cartilaginous fish characterized by a ribless endoskeleton, dermal denticles, five to seven gill slits on each side, and pectoral fins that are not fused to the head. Modern sharks are classified within the division Selachii [1] (or Selachimorpha) [2] and are the sister group to the Batoidea (rays and kin).
In sharks, the ampullae of Lorenzini are electroreceptor organs. They number in the hundreds to thousands. Sharks use the ampullae of Lorenzini to detect the electromagnetic fields that all living things produce. [25] This helps sharks (particularly the hammerhead shark) find prey. The shark has the greatest electrical sensitivity of any animal.
Other common names include bone shark, elephant shark, sailfish, and sunfish. The basking shark is a cosmopolitan migratory species found in all the world's temperate oceans. A slow-moving filter feeder , its common name derives from its habit of feeding at the surface, appearing to be basking in the warmer water there.
100 nature names that will connect your baby to the earth. 100 water-inspired names for your baby. 55 Hawaiian baby names inspired by the Aloha State. If the water brings you joy, here are 160 ...
The first shark-like chondrichthyans appeared in the oceans 400 million years ago, [1] developing into the crown group of sharks by the Early Jurassic. [2] Listed below are extant species of shark. Sharks are spread across 556 described and 23 undescribed species in eight orders. The families and genera within the orders are listed in ...
Ampullae of Lorenzini (sg.: ampulla) are electroreceptors, sense organs able to detect electric fields. They form a network of mucus -filled pores in the skin of cartilaginous fish ( sharks , rays , and chimaeras ) and of basal bony fishes such as reedfish , [ 1 ] sturgeon , [ 2 ] and lungfish . [ 1 ]
The broadnose sevengill shark (Notorynchus cepedianus) is the only extant member of the genus Notorynchus, in the family Hexanchidae. It is recognizable because of its seven gill slits, while most shark species have five gill slits, with the exception of the members of the order Hexanchiformes and the sixgill sawshark. This shark has a large ...
Hamas captured Shiri Bibas, her husband and their two children during the Oct. 7, 2023 attack. The red-headed children have become symbols of the war. Two red-headed babies are symbols in Oct. 7 ...